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Go back to the down floor from where you used the lift, there you'll see many of dead bodies hanging above your head, now press and hold triangle button standing just below of each dead body, at the end you'll see a body which is still not converted into skeleton like all other bodies. Now bring it down with triangle button and pick it up by pressing R1, take it to the lift and go up put it on the circle which opens the first door then go and pull the crank which opens the second door for some time, be quick enough to cross the door before the crank returns to its position closing the door, try right analog stick.Hope this helped.

I found what you need, it is the game walkthrough/ cheat. It is the only way I can help you, but hey this is not a bad thing to have access to all of the manuals and cheats for nearly all games you can think of, and yes I will share a walkthrough with you.

To kill the T-Rex, drop into the pool and position Lara so as the water is at her waist

as shown in the following pic

http://www.tombraiderhub.com/tr3/images/crash1.jpg

That way the T-Rex
cannot reach you. You can also avoid the T-Rex and complete the next
part quickly. Just make sure you stay away from it because you lose
health even if its tail touches you. However, killing the T-Rex makes
you have a clear area and complete the next part at your ease.
Alternative
method - As soon as you collect the Key, immediately jump
out of the ***** and dash to the newly opened gate. The T-Rex will
follow you, but it will not be able to reach you in there. Shoot
it from this safe spot until it is dead. You may need to pop out
a few times to lure it near you, because it may turn its back to
you and go away, but when you see it approaching you again, immediately
run back to your hiding place and shoot it. From these two safe
spots (the middle of the pool or the gate) you can kill the T-Rex
with your Pistols, but be prepared that the process will take some
time.
Jump out of the nest and
use the left shallow part of the pool to reach the other side of
the cavern, close where the dead raptor and the slope are. Go through
the gate you opened by collecting the Key and use the switch to open the gate beyond the pool. Exit and run towards the pool.
The gate is at the far left. If you have not killed the T-Rex,
make sure you use the left shallow part of the pool. Enter the alcove
and use the switch
to open the second gate back where you used the first switch. This gate
gets you back to the upper clearing. (The two lit torches high on the
walls of the cave will help you locate where exactly the two gates are.)

on the right take the dead man drop him in the water right beside were u pick him up at and run to the other side and wait for him to float around it will take around 10 seconds then pick him up and drop him on the pressure plate. then run to the middle jump on the second plate then it will take about 5 seconds for the gate to shut and that is plenty of time

ok before you fought some gorgons and some undead, in the hallway that leads you to the place where you get the shield there should be a big crate or a box filled with like wood or stone fragments take that box and go in front of the door and then kick it to the button pedestal that operates the swinging door and make sure it goes on top of it and stand on the door but make sure you hold r2 until hes powered up the kick